Influence of deposited energy on shock wave induced by underwater pulsed current discharge

Abstract

In this paper, an integrated experimental system is established to study the influence of deposited energy on the intensity of the shock wave induced by underwater pulse discharge. Considering the time varying behavior of the arc, the calculation methods of the deposited energy into the plasma channel and the average arc resistance are proposed and presented. The effect of the breakdown process on the deposited energy and the shock wave is analyzed. It can be concluded that the shock wave intensity can be improved by depositing more energy in the first half oscillation period and increasing the arc resistance. It is also found that the energy deposition and the shock wave intensity are significantly influenced by the breakdown time delay and the shape of the initial plasma channel.

Mechanism of pulsed electric field enzyme activity change and pulsed discharge permeabilization of agricultural products

“…This can be done by increasing the electric pulse rise time, by impedance modification, and by reducing the water conductivity between the electrodes. 40,41) A voltage of 7 kV can generate a shock wave peak pressure of 20 MPa (Fig. 14), with an energy conversion of around 10%.…”

Experimental and numerical study on the cracking characteristics of repetitive electrohydraulic discharge shock waves

“…The EHS peak pressure P m (MPa) is estimated as shown in equation (4), where E B (kJ) is the discharge energy at the time of breakdown, and h is the distance attenuation reference coefficient [17]. θ is the energy attenuation coefficient; the reference range of θ is 0.35-0.54 [10,17,18]. The value in this article is 0.5.…”

“…The transmission wave P c (t) of the EHS load is applied to the water-rock interface as a spherical wave. The radial stress σ r and the tangential stress σ θ of the rock driven by the EHS load are related to P c (t), as shown in equation (18), where k = σ r /σ θ :…”

Investigations of dynamics of a single spark-induced bubble in saline water

“…The spark discharge discussed here is quite different from the electrode-to-electrode discharge. Li et al established an integrated electrode-to-electrode discharge system to investigate the influence of deposited energy on the intensity of the acoustic wave, and the dynamics of the arc channel connected between the two electrodes were analyzed [51]. As presented in figure 15(a), the load minimum resistance of the spark discharge is around 9 Ohm, which is much higher than tens of mOhm introduced in [50,51].…”

“…Li et al established an integrated electrode-to-electrode discharge system to investigate the influence of deposited energy on the intensity of the acoustic wave, and the dynamics of the arc channel connected between the two electrodes were analyzed [51]. As presented in figure 15(a), the load minimum resistance of the spark discharge is around 9 Ohm, which is much higher than tens of mOhm introduced in [50,51]. A reasonable load resistance diagram is shown in figure 15(b), the total load resistance is composed of the plasma resistance and the saline water resistance, and they are time-varying and connected in series during the energy deposition process, and the water resistance is much larger than that of plasma.…”